Coffee making machine



July.2, 1940. J. M. F. OYEN 2,206,424

' COFFEE MAKING MACHINE Filed March 6, 1939 I 8 Sheets-Sheet 1 a. A I bti HIIE' I 0 Eel July 2, 1940. J. QYEN 2,206,424

COFFEE MAKING MACHINE Filed March 6, 1939 8 Sheets-Sheet 2 July 2, J. M. F. OYEN COFFEE MAKING MACHINE Filed March 6, 1939 8 Sheets-Sheet 3 J- u I I I I I l I I l I I I l I l I I I I l l I l I l l llll Ill {will f. z"if a 2w .1 4 28,6 3 H 1,10: m m 5 4 a W M 2 w. i 6 1w 1 %4% /& M I 1 m @1 4: 7 |1||l1| w 1 .w 7 b i; F \wr II I flu r 5 ll 7 m "u fi m F w a a m. 5 12 7 x 6 5 7 5 I M ll 0 w 9 W MH/ 1 i- \L/ w m .r m. Mn ui l 2 m e;

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Writ? #ffffff) y 2, 1940- J. M. F. OYEN 3 COFFEE MAKING MACHINE Filed March 6, 1959 8 Sheets-Sheet 4 97 F6. XE

\VAEEVAR g mvawow y 1940- J. M. F.- OYEN 2,206,424

COFFEE MAKING MACHINE Filed March 6, 1959 a Sheets-Sheet s y 2, 1940- J. M. F. OYEN I 2,205,424

COEFEE MAKING MACHINE Filed March a, 1939 a Sheets-Sheet e July 2, .1. M. F. (DY-EN COFFEE MAKING MACHINE Filed March 6, 1939 a Sheets-Sheet 7 y 2, 1940 J. M. F. OYEN COFFEE MAKING MACHINE a Sheets-Sheet 8 Filed March 6, 1939 Patented July 2, 1940 UNITED STATES PATENT OFFICE.

12 Claims.

The present invention relates toa cofiee making machine of the type in which the beverage is made by letting hot water percolate through a series of superposed coifee supporting screens in a stationary vertical percolating chamber, the

cofiee supported by the screens at timed intervals being advanced downwardly, new cofiee and water being added to the topmost screen, the liquid ccfiee going into a storage tank and the coffee grounds on the lowermost screen being discharged into a separate receptacle.

One of the objects of the present invention is to store a supply of roasted coffee beans at the top of the machine, to grind these coffee beans in the normal running of the machine and to deliver the freshly ground cofiee to the percolating chamber, thereby producing a beverage of superior aroma, it being a well established fact that the coffee aroma is speedily lost when coffee is stored in the granulated state.

Another object is to make the machine more compact by omitting the so-called interceptor 'platesbetween the cofifee supporting screens.

A further object is to insure a beverage of absolute clarity without any residue by positioning a filter between the lowermost cofiee supporting screen and the liquid coffee tank.

Still another object is to make all the screens in the machine reverse their position at each cycle, thus rendering them self-cleaning.

In the drawings:

Fig. 1 is a plan view of the machine.

Fig. 2 is a wiring diagram, showing the electrical circuits. Fig. 3 isa front elevation of the machine.

Fig. 4 is a section taken on line IVIV on Fig. 3.

Fig. 5 is substantially a section taken on line v v Fig. 3.

Fig. 6 is a section takenon line VI-VI Fig.1.

Fig. '7 is an elevation on line 'V1IVII Fi 6.'

Fig. 8 is a large scale section taken'on line VIIIVIII Fig. 6.

Fig. 9 is a plan view on line IX-IX Fig. 6.

Fig. 10 is a section taken on line X-X Fig. 6.

Fig. 11 is a. large scale section taken on line XI-XI Fig. 6. g

Fig. 12 is a vert al section through timing gear box.

Fig. 13 is'a section taken on line XIIL-XII on Fig. 12.

Fig. 14 is a plan view of coffee transferring mechanism.

Fig. 15 is an elevation of coffee transferring mechanism.

Fig. 16 is a section taken on line XVI-XVI on Fig. 14.

' Fig. 17 is a section taken on line XVIII-XVII Fig. 14. I

Fig. 18 is an elevation of screen reversing mechanism.

Fig. 19 is a plan view of screen reversing mechanism.

Fig. 20 is a section taken on line XX-JKX on Fig. 19. Fig. 21 is an elevation of a cam.

Fig. 22 is a section taken on line XXII-XXII on Fig. 19.

. Fig. 23 is a section taken on line XXIII-m on Fig. 18. v

Fig. 24 is a fragmentary dumping carriage track.

front elevation Fig. 25 is a section taken on line XXV-XXV Fig. 24.

Fig. 26 is substantially a rear elevation of coffee dumping. carriage.

Fig. 2'? is substantially an elevation (enlarged) along line xxv 1 xxvn Fig. 25.

Fig. 28 is substantially a section taken on line XXVIII-XXVIII Fig. 24.

Fig. 29 is an elevation of coffee mill controlling switch arrangement.

Figs. 29a, 29b and. 290 are details (reduced) in the plane of Fig. 29.

Fig. 30 is a section taken on line ,XXX XXX,

Fig. 29.

.-Fig. 31 is aplan view of filter supporting frame.

Fig. 32 is a front elevation of filter supporting frame, showing also position of same in machine. Fig. 33 is an end view of filter supporting frame.

Fig. 34 is a section taken XXXIV on Fig. 31. 'Fig. is a plan view oi. a scale.

on line KEV- filter in a reduced als in the several views, the

extended cover 2 (Figs. 3 and invention is illus- .trated as comprising a water boiler l with its 5) from the corner of which cover a riser 3 extends vertically to support and communicate with a header 4. A coffee mill 5 is fastened to the header 4 and carries a bracket 6 supporting a solenoid I. An

1 I which plate also carries the to be described presently.

driving mechanism A dumping carriage I 8 for discharging used coffee grounds is normally disposed beneath the coffee percolating chamber 8-9 and operates'between tracks I1 and I8. A coffee reservoir I9 to receive liquid coffee is imbedded in cover 2 and extends downwardly into boiler I so as to retain the high temperature 01' the liquid coffee. A receptacle 20 is provided for the discharged coffee grounds. Hot water is delivered to theupper end of the 'percolator chamber through a circular spout 2I (Figs. 3, 5, 6 and 9) which communicates with a water measuring chamber 4a disposed within the header 4. Thetop of the measuring chamber 4a is provided with a few small holes 41) through which the chamber is slowly filled with water. A valve 22 (Fig. 6) op erates intermittently through mechanism hereafter to be described to permit the water in the measuring chamber 4a to flow through the spout 2I., A stem .23 which operates the valve 22, ex-

' tends upwardly througha vent tube 24, the purpose of this tube being to maintain at all times the atmospheric pressure in the measuring chamber 4a in order to insure free outlet and inlet of water from and into the measuring chamber.

the coffee at the initial stage of percolation. A

burner 25 is positioned below the boiler I and a thermostat 28 within the boiler operates a conventional valve 280 (see Figs. 3-5) to control the flow of gas to said burner through a supply electromagnetic valve 30 is controlled by an electric switch I04. When the .water reaches its maximum levelthe float 32 through its rod 32a trips the bracket "Ma and with it the switch I94 to the lower part of the boiler I.

As shown in Fig. 1 the motor l3'through co pling 34 drives shaft 35 which is supported by, bearings, 38' and/31 and which at the other end has an outboard pinion I 4' engaging gear I5 on shaft 38, which latter shaft is supported in bearings 39 and 40 and transmits power through coupling M to the timing gears in box I2 to be later described in detail.

Onerevolution of motor I3 andshaft 35 constitutes one cycle of operation. The ratio of pinion I4 to gear I5 is 1 to 2,, therefore one half revolution of shaft 38 constitutes one cycle of operation. Besides transmitting power to the timing mechanism in box I2 the function of shaft rection of motion (see arrow on Figs. 18, 20 and 21) it is evident that cam 48 is slightly advanced of cam 48, while cam 48 is similarly advanced of cam 41. Levers 45a; 48a and 41a are with pins pivotably connected respectively to rods45b,-48b and 41b, part of which rods are shaped into a gear rack, as shown on rod 4117. These racks are positioned to engage screen pinions 42a, 43a and 44a. It will be seen from Fig. 18 that 41b operates 44a,.reversing screen 44. Similarly 48b operates pinion 43a, reversing screens 43 and 45b operates pinion 42a reversing, screen 42 (see Fig. 3). It is evident therefore that when shaft 38 is revolving in the direction indicated by arrow (see Figs. 18, 20 and 21) cam 45 being the most advanced will be the first one to take hold of its roller 45c, pressing it down and with it the lever 450. which in turn presses down rod 45b the rack of which engages with pinion 42a, reversing lowermost'screen 42. The next cam to act is 48, reversing middle screen 43, and finally cam 47 reversing topmost screen 44.

The rods' 45b, 48b and 41b are guided in two brackets 48, fastened to the side of the percolating chamber 9, compellingthem to move in a straight, line. To compensatefor the difference in distance caused by the angular movement of levers 45a, 48a' and 41a, these levers are pivoted by means of rocker arms 45d, 48d and 41d, the rocker arms being pivotally supported by pin 49 L on which they turn and which is supported by two brackets 58. The cams 45, 48 and 41 are substantially divided into two, each half having a circular groove, each groove belonging to one cycle of operation.

Shaft 38 transmits power to the timing gear box I2 through coupling-4| of which H is one half (see Fig. 12), driving shaft on shaft 5| is" keyed an intermittent gear 52 which engages an intermittent pinion 53, the latter being keyed to gear 54 whichengages pinion 55 which latter is free to rotate on shaft 5|. Shaft 58,-on

which gear 54 with 53 is keyed serves merely as a countershaft. To the extended hub of gear 55 is keyed achain wheel 51 which through chain 510. drives chain sprocket 58 (see Figs. 3 and 5), the latter actuating the movement of the dumping carriage IS. The intermittent gear 52 every half revolution (constituting one cycle of the operation of the machine) revolves the pinion 53 one quarter. of a turn. The ratio of gear 84 to pinion 55 is 2 to 1, consequently the pinion 55 and with it chain sprocket 51 make one half revolution at the same time. The ratio of chain sprocket 51 to chain sprocket 58 is as 2 to 1, consequentlyi chain sprocket 58 makes one complete tum-per cycle. 'Mounted on sprocket 58 is a crank 59 which imparts reciprocating movement to dumping carriage I8 through lever 88, to be described in detail presently. p

The adjustable cam 8| (Figs. 1, 30 and 29) controls an electric switch I93 stopping or starting motor 5a of the coffee mill'l. simply a disc with a projecting pin that trips the switch I82 downwards and thereby admits current to solenoid I.

The left half of Ila of coflee dumping carriage I8 (Fig. 25) has an extended hub I8 the Bore of which serves as a bearing for the Journal 83b of screen 83 and the cylindrical outside of which supports the ratchetcase 84 and the ratchet wheel 85. 88 is a spacing collar. The ratchet case 84 is free to revolve on hub I80 andhas one side milled out to receive ratchet wheel 85, three pawls 84b and three blade springs 840 (see Fig. 2'7) and is on the other side formed into a pinion 64a. n the upper side of track I! is bolted a rack 88 positioned to engage pinion 04a when dumping carriage is moved toward dumping position. It is evident that when dumping carriage is moved to the right, the pinion 84a engaging pin 6511 through spacing collar 88 connected with screen journal 6317. To the carriage half IIib (Fig.

26) is fastened a blade spring I0 with a projec tion 10a, the latter corresponding in shape to two notches 69a in wheel 69,- the latter being keyed to screen journal 63a. The object of this arrangement is to secure screen 63 in the horizontal position and prevent any accidental turning of same. On the return stroke of the dumping carriage I6 the pinion 641: with the ratchet case 64 will turn in the opposite direction of the arrow and will cause no movement of the screen.

To insure complete removal of the coffee grounds on screen 68, a stripper II is introduced, made of flexible material and pivoted on pin I2, the latter being supported by tracks :I 1I8. The stripper is counterbalanced by weight 14 and prevented from turning in one direction by notch I3, but free-.to turn in the opposite direction to clear the passing screen when dumping carof the carriage strip the screen of any coffee grounds adhering to the underside of same.

/ The dumping carriage I6 is provided with 4 rollers I5 fitting on shaft I6; these rollers move in tracks I1 and I8, and the reciprocating movement of the carriage is caused by levers 90 and 80a, actuated by crank 59 on sprocket 58. These levers 60 and 600, are pinned to shaft .I'i, therefore move in unison (see Fig. 5). Shaft 'II also serves as a fulcrum for the levers. In the movement, of the dumping carriage I 6, the screen 03 is utilized, the extensions 03c on same bei provided with rollers 63d which slide in the lower slots of 60 and 00a. v

Fig. 29 shows an adjustable cam, consisting of the center piece GI with its two hubs Sic, on which hubs are slidably positioned the segments Gla and Gib. In order to clearly show the construction these three parts are shown in Figs.

29a, 29b and 290 in the position occupied on the assembly Fig. 29. Centerpiece M has a number of tapped holes 6Ie, concentrically located and has for a distance of 120 its diameter increased. The outer pieces are fiat segments of 120, the outside radii being equal to the larger radius of GI. Each segment is provided with a circular slot, the mean radius of which is equal to the pitch radius of the tapped holes tie in centerpiece 6|. The roller I8 has a width slightly in excess of the combined width of the three parts 6|, Sia, and Bib. Therefore in sliding the segments on the hubs of centerpiece 6|, and.fastening them with screws, an effective cam surface may be obtained varying from 120 to nearly 360.

The roller 18 is mounted on a pin 19a in bracket I9, this latter being pivotally mounted in bracket 80. In bracket I9 an electric switch- I03 is clamped, this switch controlling the current to coifee grinding motor 5a. In the position shown,

the current is on and the motor 5a is running.

justing the cam as described supra the same will hold the switch I03 in the "on position in a longer or shorter period, according to the angle formed by GIa and Gib, thus varying the grinding nne.

The delivery of the water from'the' measuring chamber 4c is controlled from shaft 35 which has a helical gear 8| engaging another helical gear 82 on shaft 83, thelatter being supported in I bearings 84 and 05; bearing 85 is located on top of header 4. At the upper end of shaft 83 is keyed a third helical gear 86, engaging a fourth helical gear 81, these helical gears being substantially alike with a ratio of 1 to 1. The gear 81 is-keyed to shaft 88 (see Fig. 6), this latter "carrying on its end a cam 89 and being suptakes care of the difference in distance caused by the angular movement of lever 92, this lever being held in place at collar 91 by means of 2 pins 98 .(Figs. 6 and 11). Rocker arm 93 is made wide to provide for lateral stability. '(See Fig. 8.) The bracket 99 is-provided to guide the valve stem 23.

The cofiee mill 5 is of a conventional type having its hopper for roasted cofiee beans on top and its electric motor 5a at the bottom, the

ground coifee being discharged at spout 5b which tegral with bracket 0 (see Figs. 3, 14 and 15). A plunger I09 has a sliding fit in cylinder 8a and a plunger rod I01 fastened to plunger I06 is slotted at one end to receive lever I 08, a roller H3 (see Fig. 16) being-inserted on a pin M6 to engage the slotted portion of leverv I08. .The lever I08 turns on fulcrum stud III, fastened to lower part'of bracket 6. v The solenoid plunger In is with a pin H2 connected with both lever I08 andspring stem H0. When the solenoid is energized, plunger Ia pulls the lever I08 towards the solenoid causing the plunger rod I07 with plunger I08 forward pushing the ground coffee which has been delivered from the coffee mill during the preceding cycle" out into the percolating chamber. As soon as the current is off the solenoid, the helical spring I09 forces the whole system back toits original position.

To insure agafimst any coffee being transferred from coffee mill 5 to cylinder 6a during the movement ofthe solenoid, a gate I0'Ia fastened to opens chute againon the return movement.

plunger rod I07 operates to close chute 5c,'then The control of the coffee level in coffee storage tank I9 is accomplished in following manner: A

float III (Fig. '3) is carried by a tubular rod II8 which closes over the lower end of a'rod II9. When the" coffee in the receptacle I9 reaches the desired level the upper end of the tube strikes a collar II9a adjustably secured to rod H9 and raises this rod until it engages and rocks a pivoted bracket I20, in which the electric switch IOI is clamped, thus opening the plate I I50, extending upwardly at an angle. Two

angle clips 5d confine one end of the frame.

to the side of the coffee receptacle I8 and 2 spring clips ll5e keep the frame. securely in position. Two hooks H5! are fastened to plate Ilia to receive the filter cloth III, and the ends of the cross wires IlSb are shaped into hooks by the purpose of which is to secure the straining cloth H6 by means of the eyelets 6a. It will be seen that the filter cloth H6 which is drawn to a reduced scale has eyelets Ilia which correspond to hooks .I I5] and H59. At intervals this complete frame is removed and a clean one is put in its place. i v

For removal of the gases from burner 25, a

, tube IN is connected to boiler I in following manner: The lower 'end of tube I2I' is substantially increased and turned to fit into the bored portion of the corner In of boiler I. A packing' I23 is inserted above the increased portion of tube HI and a packing gland I22 is slipped over the tube I2I and is screwed down, pressing 1 causes sprocket 58 to make a full turn, the crank 59 and levers G and 60a taking dumping carriage I8 to and from dumping position, during which movement dumping carriage screen 63, is reversed, and stripped of coflee. Immediately thereupon screen 42 is reversed by cam 45, the coffee supported by said screen being dropp d to moving carriage screen 63. Directly thereupon screen 43 is reversed by cam 46, dropping its coffee to ,screen 42, whereupon screen 44 is reversed by cam 41, its coffee being dropped to screen 43. The coffee, ground in the previous cycle, is at this moment contained in cylinder 6a (Figs. 14 and 15) The cam 62 (Fig. 1) now trips the electric switch I02 energizing solenoid I; whereupon the coffee is pushed out into percolating chamber as previously explained. The cam 89 (see Figs. 6 and 7) now takes hold of lever 92 lifting the valve 22 whereupon the water isdelivered to percolating chamber.

Looking at intermittent, gear 52 (Fig. 13) it is evident-that wenow have a comparatively long P riod ("dwell") during which no motion takes place of the timing gear. During this dwell the hot water percolates-through all the coffee supporting screens, the liquid coifee running onto the filter I II and' land into the liquid coffee receptacle. During this dwell the cofi'eefor the next cycle is ground'in the coffee mill 5.

Referring to wiring diagram (Fig. 2) the manually operated switches-II. and III will be closed when starting the machine to make coffee. It will be seen that when switch Ill opens, the-entire mechanism will be stopped.' During the operation of the machine, switch I02 will control the motor a, switch I02 the solenoid 'l and switch I the water supply magnetic valve 20.

To clean the machine open switch I05 which will cut off the coffee supply. Hot water will then" run through the machine and clean it.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. In a coffee making machine, a plurality of mutually superposed coffee supporting screens,

means for intermittently inverting the screens in timed relation to cause coffee supported by them to be advanced downwardly step by step, and means for supplying water to percolate through the coife'e supported by the screens.

2. In a coffee making machine, a plurality of mutually superposed coffee supporting screens and means for intermittently inverting the screens in time relation to discharge coffee supported by them and position them for reception of coffee on their opposite sides.

3. In a coffee making machine, a vertically disposed percolating chamber, pivotally supported coffee screens in said chamber, means for feeding measured charges of fresh dry coffee to the topmost screen, means for intermittently inverting the screens in timed relations to effect transfer of said charges from screen to screen downwardly through the percolating chamber and means for supplying hot water to the top of said chamber to percolate through the coffee supported on said screens.

4. In a coffee making machine, a vertically disposed percolating chamber, pivotally supported coffee screens in said chamber, means for feeding measured charges of fresh dry coffee to the topmost screens, means for intermittently inverting the screens in timed relation to effect transfer of said charges from screen to screen downwardly through the percolating chamber, means for supplying hot water to the top of said chamber to percolate through the coffee supported on said screens and means for imparting a whirling motion to the water to facilitate the initial percolation. v

5. In a coflee making machine, a vertically disposed percolating chamber, pivotally supported charges offresh dry coffee to the topmost screen,

means for imparting pivotal movement to the screens to eifect transfer of said charges from screen to screen downwardly through the per-, colatingchamber, a screen beneath said chamber to finally receive said charges of coffee, means for removing the last named screen from beneath the chamber and discharge coffee therefrom and means for inverting said screen.

7. In a coffee making machine, a vertically disposed percolating chamber, pivotally supported coffee screens in said chamber, means for feeding charges of fresh dry coffee to the topmost screen, ,nieans'for imparting pivotal movement to the screens'to effect transfer of said charges from screen to screen downwardly through the percolating chamber, a screen beneath said chamber to finally receive said charges of coffee: means for removing the last named screen from beneath the chamber, means for inverting said screen and means for stripping the-coffee therefrom.

8. In a coffee making machine, a vertically disposed percolating chamber, pivotally supported coffee screens in said chamber, means for feeding charges of dry fresh coffee to the topmost screen, means for imparting pivotal movement to the screens to effect transfer of said charges from screen to screen downwardly through the percolating chamber, a screen beneath said chamber to finally receive said charges of coffee, means for removing the last named screen from beneath the chamber, means for inverting said screens, means for stripping the coffee therefrom, a liquid coffee container and a filter between the last named screen and the liquid coflee container.

9. In a. coffee making machine, a vertically disposed percolating chamber having superposed cofiee supporting screens and means for feeding measured charges of fresh cofiee thereto, said means comprising a hopper for roasted cofiee beans, means for grinding the cofiee beans, means for varying the duration of the grinding time, means for transferring the ground coffee to the topmost screen in said chamber, means for delivery of water to said chamber, and means for intermittently inverting said screens at intervals whereby the-charges of cofiee are transferred from screen to screen.

10. In a coffee making machine of the character described, comprising in combination, a

hot watersupply; means for automatically controlling the temperature of the water; means for automatically adding water and maintaining the water level in said hot water supply; a percolating chamber mounted adjacent to said hot water supply; a plurality of cofiee supporting screens vertically disposed in said percolating chamber; automatic means for grinding coffee mounted adjacent to said percolating chamber; adjustable automatic means for governing the grinding time of said coflee grinding means;

automatic means for transferring measured quantities of ground coffee from said coffee grinding means to the topmost coffee supportv 11. In a coffee making machine of the char ing screen; automatic means for intermittently inverting said coffee supporting screens thereby transferring the charges from screen to screen, and automatic means for admitting hot water at; intervals to'the topmost coffee supporting screen.

acter described, comprising in combination, a hot Water supply; means for automatically controlling the temperature of the water; means for;

automatically adding water and maintaining the water level in said hot water supply; a percolating chamber mounted adjacent to said hot water supply; a plurality of coffee supporting screens vertically disposed in said percolating chamber; automatic means for grinding coffee mounted adjacent to said percolating chamber;

adjustable automatic means for governing the liquid coffee container whereby. the drive means are started and stopped automatically to maintain a constant level of finished liquid coffee.

12. An automatic coffee making machine such as claimed in claim llwheresaidautomaticmeans for admitting hot water comprise a cam operated valve driven by the drive means and actuated at predetermined intervals; and where said coffee measuring means consist of a solenoid operated plunger actuated at predetermined intervals by I timing means driven by said drive means.

JOHN M. F. OYEN. 

